Notices of Public Information NOTICES of PUBLIC INFORMATION

Arizona Administrative Register / Secretary of State Notices of Public Information NOTICES OF PUBLIC INFORMATION Notices of Public Information contain corrections that agencies wish to make to their notices of rulemaking; miscellaneous rulemaking information that does not fit into any other category of notice; and other types of information required by statute to be published in the Register. Because of the variety of material that is contained in a Notice of Public Information, the Office of the Secretary of State has not established a specific format for these notices. NOTICE OF PUBLIC INFORMATION DEPARTMENT OF ENVIRONMENTAL QUALITY 1. A.R.S. Title and its heading: 49, The Environment A.R.S. Chapter and its heading: 2, Water Quality Control A.R.S. Article and its heading: 2.1, Total Maximum Daily Loads Section: A.R.S. § 49-234, Total maximum daily loads; implementation plans 2. The public information relating to the listed statute: Pursuant to A.R.S. § 49-234, the Arizona Department of Environmental Quality (Department or ADEQ) is required to develop a total maximum daily load (TMDL) for navigable waters that are listed as impaired. The purpose of this notice is to publish the Department’s determinations of total pollutant loadings for TMDLs in the Tonto Creek Water- shed that the Department intends to submit to the Regional Administrator for Region 9, U.S. Environmental Protec- tion Agency (“EPA”) for approval. The Department previously provided public notice and an opportunity for public comment on the “Draft Tonto Creek & Christopher Creek TMDLs for e. coli.” in The Payson Roundup and Advisor, a newspaper of general circulation in the affected area, on March 24, 2004. The ADEQ has included a summary of all comments and the Department’s responses, in this notice. The purpose of this notice is to satisfy A.R.S. §§ 49-234(D) and 49-234(E), which require the Department to publish in the Arizona Administrative Register the determination of total pollutant loadings that will not result in impairment and the proposed allocations among the contributing sources that are sufficient to achieve the total pollutant loadings. 3. Total Maximum Daily Loads (TMDLs) A. Total Maximum Daily Load (TMDL) Process A Total Maximum Daily Load (TMDL) represents the total load of a pollutant that can be assimilated by a waterbody on a daily basis and still meet the applicable water quality standard. The TMDL can be expressed as the total mass or quantity of a pollutant that can enter the waterbody within a unit of time. In most cases, the TMDL determines the allowable pounds per day of a pollutant and divides it among the various contributors in the watershed as wasteload (i.e., point source discharge) and load (i.e., nonpoint source) allocations. The TMDL must also account for natural background sources and provide a margin of safety. For nonpoint sources such as accelerated erosion or internal nutrient cycling, it may not be feasible or useful to derive a figure in terms of pounds per day. In such cases, a percent reduction in pollutant loading may be proposed. A load analysis may take the form of a phased TMDL, if source reduction or remediation can be better accomplished through an iterative approach. In Arizona, as in other states, changes in standards or the establishment of site-specific standards are the result of ongoing science-based investigations or changes in toxicity criteria from EPA. Changes in designated uses and standards are part of the surface water standards triennial review process and are subject to public review. Standards are not changed simply to bring the waterbody into compliance, but are based on sound science that includes evaluation of the risk of impact to humans or aquatic and wildlife. Existing uses of the waterbody and natural conditions are con- sidered when standards for specific water segments are established. These TMDLs meet or exceed the following EPA Region 9 criteria for approval: Plan to meet State Surface Water Quality Standards: The TMDLs include a study and a plan for the specific pollutants that must be addressed to ensure that applicable water quality standards are attained. Describe quantified water quality goals, targets, or endpoints: The TMDL must establish numeric endpoints to protect water quality standards, which are based on beneficial use, as a result of implementing the TMDLs. This often requires an interpretation that clearly describes the linkage(s) between factors impacting water quality standards. Analyze/account for all sources of pollutants: All significant pollutant sources are described, including the magni- tude and location of sources. Identify pollution reduction goals: The TMDL plan includes pollutant reduction targets for all point and nonpoint sources of pollution. Describe the linkage between water quality endpoints and pollutants of concern: The TMDLs must explain the relationship between the numeric targets and the pollutants of concern. That is, do the recommended pollutant load allocations exceed the loading capacity of the receiving water? Volume 10, Issue 20 Page 2014 May 14, 2004 Arizona Administrative Register / Secretary of State Notices of Public Information Develop margin of safety that considers uncertainties, seasonal variations, and critical conditions: The TMDLs must describe how any uncertainties regarding the ability of the plan to meet water quality standards that have been addressed. The plan must consider these issues in its recommended pollution reduction targets. Provide implementation recommendations for pollutant reduction actions and a monitoring plan: The TMDLs should provide a specific process and schedule for achieving pollutant reduction targets. A monitoring plan should also be included, especially where management actions will be phased in over time and to assess the validity of the pollutant reduction goals. Include an appropriate level of public involvement in the TMDL process: This is usually met by publishing public notice of the TMDLs in a newspaper of general circulation in the area affected by the study, circulating the TMDLs for public comment, and holding public meetings in local communities. Public involvement must be docu- mented in the state’s TMDL submittal to EPA Region 9. In addition, these TMDLs comply with the public notification requirements of A.R.S. Title 49, Chapter 2, Arti- cle 2.1: Publication of these TMDLs in the Arizona Administrative Register is required per Arizona Revised Statute, Title 49, Chapter 2, Article 2.1 prior to submission of the TMDL to EPA. The Department shall: 1. Prepare a draft estimate of the total amount of each pollutant that causes impairment from all sources that may be added to a navigable water while still allowing the navigable water to achieve and maintain applicable surface water quality standards, and provide public notice and an opportunity for comment in a newspaper of general circulation in the affected area; 2. Publish a notice in the Arizona Administrative Register (this notice) of the determination of total pollutant loadings that will not result in impairment, along with responses to comments received on the draft total pollutant loadings published in a newspaper of general circulation; 3. Make reasonable and equitable allocations among TMDL sources, and provide public notice and an opportunity for comment in a newspaper of general circulation in the affected area; 4. Publish a notice in the Arizona Administrative Register (this notice) of the allocations among contributing sources, along with responses to comments received on the draft allocations published in a newspaper of general circulation. Federal law only requires the submittal of the pollutant loadings to EPA for approval. However, the Department considers the pollutant loadings and the draft allocations to be integrally related and should be presented together to afford the public a complete understanding of the issues, outcomes and recommendations of the TMDL analysis. For that reason, the Department has combined the loadings and allocations in both the public notice in the local newspaper as well as in this publication in the Arizona Administrative Register. B. Total Maximum Daily Load for Tonto and Christopher Creeks Please note that the numbers in the TMDL Table have been updated since the release of the first draft which was made available to the public on March 24, 2004. This update was made to accommodate a different presentation of the MOS. Project history In 1994, the Arizona Department of Game and Fish (ADGF) requested review of the nutrient water quality standards for Tonto Creek. ADEQ did not find reason to change the standards. As a result, the ADGF requested a variance for its National Pollution Discharge Elimination System (NPDES) discharge permit for the Tonto Creek hatchery. From 1994 through 1996, as a part of an investigation triggered by the ADGF requests, ADEQ measured E. coli. levels in upper Tonto Creek and Christopher Creek. This data was sufficient to determine impairment which resulted in the 303[d]-listing, but was insufficient by itself to isolate sources or calculate loads; therefore, ADEQ supplemented the historic data by collecting additional data specific to the goals of source quantification and TMDL calculation. Analysis of historic sampling indicated that high bacteria levels appeared to correlate with high recreation times; i.e., summer holiday weekends. Based on this, ADEQ conducted source identification sampling during the summers of 2000, 2002, 2003 and the

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